USN-4069-1: Linux kernel vulnerabilities
linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 19.04
Summary
Several security issues were fixed in the Linux kernel.
Software Description
- linux – Linux kernel
- linux-aws – Linux kernel for Amazon Web Services (AWS) systems
- linux-azure – Linux kernel for Microsoft Azure Cloud systems
- linux-gcp – Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm – Linux kernel for cloud environments
- linux-raspi2 – Linux kernel for Raspberry Pi 2
- linux-snapdragon – Linux kernel for Snapdragon processors
Details
It was discovered that an integer overflow existed in the Linux kernel when
reference counting pages, leading to potential use-after-free issues. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-11487)
Jann Horn discovered that a race condition existed in the Linux kernel when
performing core dumps. A local attacker could use this to cause a denial of
service (system crash) or expose sensitive information. (CVE-2019-11599)
It was discovered that the ext4 file system implementation in the Linux
kernel did not properly zero out memory in some situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2019-11833)
It was discovered that the Bluetooth Human Interface Device Protocol (HIDP)
implementation in the Linux kernel did not properly verify strings were
NULL terminated in certain situations. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2019-11884)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 19.04
- linux-image-5.0.0-1011-aws – 5.0.0-1011.12
- linux-image-5.0.0-1011-gcp – 5.0.0-1011.11
- linux-image-5.0.0-1011-kvm – 5.0.0-1011.12
- linux-image-5.0.0-1012-azure – 5.0.0-1012.12
- linux-image-5.0.0-1013-raspi2 – 5.0.0-1013.13
- linux-image-5.0.0-1017-snapdragon – 5.0.0-1017.18
- linux-image-5.0.0-21-generic – 5.0.0-21.22
- linux-image-5.0.0-21-generic-lpae – 5.0.0-21.22
- linux-image-5.0.0-21-lowlatency – 5.0.0-21.22
- linux-image-aws – 5.0.0.1011.11
- linux-image-azure – 5.0.0.1012.11
- linux-image-gcp – 5.0.0.1011.11
- linux-image-generic – 5.0.0.21.22
- linux-image-generic-lpae – 5.0.0.21.22
- linux-image-gke – 5.0.0.1011.11
- linux-image-kvm – 5.0.0.1011.11
- linux-image-lowlatency – 5.0.0.21.22
- linux-image-raspi2 – 5.0.0.1013.10
- linux-image-snapdragon – 5.0.0.1017.10
- linux-image-virtual – 5.0.0.21.22
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
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